IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0152024
(1998-09-11)
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발명자
/ 주소 |
- O'Toole, James E.
- Tuttle, John R.
- Tuttle, Mark E.
- Lowrey, Tyler
- Devereaux, Kevin M.
- Pax, George E.
- Higgins, Brian P.
- Ovard, David K.
- Rotzoll, Robert R.
- Yu, Shu-Sun
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
16 인용 특허 :
128 |
초록
▼
A radio frequency identification device comprises an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integrated circuit including the receive
A radio frequency identification device comprises an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integrated circuit including the receiver, the transmitter, and the microprocessor. Because the device includes an active transponder, instead of a transponder which relies on magnetic coupling for power, the device has a much greater range.
대표청구항
▼
1. A radio frequency communications system comprising:an antenna;an integrated circuit including an inductorless receiver having a Schottky diode detector including a Schottky diode having first and second terminals, the first terminal being coupled to the antenna; anda current source directly conne
1. A radio frequency communications system comprising:an antenna;an integrated circuit including an inductorless receiver having a Schottky diode detector including a Schottky diode having first and second terminals, the first terminal being coupled to the antenna; anda current source directly connected to the second terminal of the Schottky diode to drive current through the antenna and the Schottky diode. 2. A system comprising:an antenna;a transponder including an inductorless receiver having a Schottky diode detector including a Schottky diode having a first terminal coupled to the antenna and having a second terminal; andmeans for driving current through both the antenna and the Schottky diode in a direction from the first terminal to the second terminal, the driving means being directly connected to the second terminal. 3. A system comprising:an antenna;a transponder including an inductorless receiver having a Schottky diode detector including a Schottky diode having a first terminal coupled to the antenna and having a second terminal; andmeans for driving current through both the antenna and the Schottky diode in a direction from the second terminal to the first terminal, the driving means being directly connected to the second terminal. 4. A radio frequency communications system comprising:an antenna;an integrated circuit including an inductorless receiver having a Schottky diode detector including a Schottky diode having a cathode coupled to the antenna and having an anode, the Schottky diode detector further including a capacitor connected between the anode and ground, and including a capacitor having a first contact connected to the anode and having a second contact defining an output of the Schottky diode detector; anda current source connected to the anode to drive current through the antenna and the Schottky diode in a direction from the anode to the cathode, wherein the current source is directly connected to the anode. 5. A system comprising:an antenna;a transponder including an inductorless receiver having a Schottky diode detector including a Schottky diode having a cathode coupled to the antenna and having an anode; andmeans for driving current through both the antenna and the Schottky diode in a direction from the anode to the cathode, the driving means being directly connected to the anode. 6. A radio frequency communications system comprising:an antenna;an integrated circuit including an inductorless receiver having a Schottky diode detector including a Schottky diode having a cathode coupled to the antenna and having an anode, the Schottky diode detector further including a capacitor connected between the anode and ground, and including a capacitor having a first contact connected to the anode and having a second contact defining an output of the Schottky diode detector, the integrated circuit further including a clock recovery circuit recovering a clock from falling edges only of a signal at the output of the Schottky diode detector; anda current source coupled to drive current through the antenna and the Schottky diode in a direction from the anode to the cathode, the current source being directly connected to the anode. 7. A method of recovering a clock in a radio frequency communications system, the method comprising:providing an antenna;providing an inductorless receiver having a Schottky diode detector including a Schottky diode having a cathode coupled to the antenna and having an anode, the Schottky diode detector further including a capacitor connected between the anode and ground, and including a capacitor having a first contact connected to the anode and having a second contact defining an output of the Schottky diode detector;driving current, using a current source, through the antenna and the Schottky diode in a direction from the anode to the cathode, the current source being directly connected to the anode; andrecovering a clock from falling edges only of a signal at the output of the Sch ottky diode detector. 8. A radio frequency communications system comprising:an antenna;an integrated circuit including an inductorless receiver having a Schottky diode detector including a Schottky diode having first and second terminals, the first terminal coupled to the antenna; anda current source directly connected to the second terminal of the Schottky diode to drive current through the antenna and the Schottky diode to adjust bias current across the Schottky diode to realize a desired resistance across the Schottky diode, thereby enabling tuning and detuning of the receiver. 9. The system of claim 8, wherein the current source is configured to forward bias the Schottky diode to realize a desired resistance across the Schottky diode. 10. The system of claim 8, further comprising:a capacitor provided between the cathode and ground, wherein the capacitor provides a radio frequency short to ground to enable substantially all of RF voltage to appear across the Schottky diode, thereby minimizing a baseband signal produced by the Schottky diode. 11. The system of claim 10, further comprising:a second capacitor connected to parallel to the capacitor, wherein the second capacitor is configured to permit different bias levels in the detector. 12. The system of claim 8, wherein the antenna comprises first and second ends, and the first end is connected to a bias voltage and the second end is connected to the first terminal of the Schottky diode. 13. A radio frequency communications system comprising:an antenna;an integrated circuit including an inductorless receiver having a Schottky diode detector including a Schottky diode having first and second terminals, the first terminal coupled to the antenna;a current source directly connected to the second terminal of the Schottky diode to drive current through the antenna and the Schottky diode to adjust bias current across the Schottky diode, thereby enabling tuning and detuning of the receiver, and wherein the current source is configured to forward bias the Schottky diode to realize a desired resistance across the Schottky diode; anda capacitor circuit to provide a radio frequency short to ground to enable substantially all of RF voltage to appear across the Schottky diode to minimize a baseband signal produced by the Schottky diode and to further permit different bias levels in the detector. 14. The system of claim 13, wherein the capacitor circuit comprises first and second capacitors connected in parallel. 15. A radio frequency communications system comprising:an antenna;an integrated circuit including an inductorless receiver having a Schottky diode detector including a Schottky diode; anda current source directly connected to the Schottky diode to drive current through the antenna and the Schottky diode, wherein one end of the antenna is coupled to a bias voltage source to provide a current sink, wherein the Schottky diode comprises first and second terminals, the first terminal being coupled to the antenna and the second terminal being coupled to the current source. 16. A radio frequency communications system comprising:an antenna having first and second ends;an inductorless receiver having a Schottky diode detector including a Schottky diode, the Schottky diode having first and second terminals; anda current source directly connected to the Schottky diode to drive current through the antenna and the Schottky diode, the first terminal being coupled to the first end of the antenna and the second terminal being coupled to the current source, the second end of the antenna being coupled to a bias voltage source to provide a current sink.
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